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https://github.com/hanzoai/visor.git
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Etienne PerotandgVisor bot
d53fe574e0
This moves the initialization of `cpuid.hostFeatureSet` out of package-level `init` and instead moves it to an explicit `cpuid.Initialize()` function. On AMD64, this saves about 512KiB of heap memory that would otherwise always be live. PiperOrigin-RevId: 514896323
76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cpuid
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import (
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"io/ioutil"
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"os"
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"regexp"
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"strings"
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"testing"
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"gvisor.dev/gvisor/pkg/hostos"
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)
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// TestHostFeatureFlags tests that all features detected by HostFeatureSet are
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// on the host.
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//
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// It does *not* verify that all features reported by the host are detected by
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// HostFeatureSet. Linux has synthetic Linux-specific features that have no
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// analog in the actual CPUID feature set.
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func TestHostFeatureFlags(t *testing.T) {
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// Extract the kernel version.
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version, err := hostos.KernelVersion()
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if err != nil {
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t.Fatalf("Unable to parse kernel version: %v", err)
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}
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// Extract all cpuinfo flags.
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cpuinfoBytes, _ := ioutil.ReadFile("/proc/cpuinfo")
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cpuinfo := string(cpuinfoBytes)
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re := regexp.MustCompile(`(?m)^flags\s+: (.*)$`)
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m := re.FindStringSubmatch(cpuinfo)
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if len(m) != 2 {
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t.Fatalf("Unable to extract flags from %q", cpuinfo)
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}
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cpuinfoFlags := make(map[string]struct{})
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for _, f := range strings.Split(m[1], " ") {
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cpuinfoFlags[f] = struct{}{}
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}
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// Check against host flags.
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fs := HostFeatureSet()
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for feature, info := range allFeatures {
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// Special cases not consistently visible. We don't mind if
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// they are exposed in earlier versions.
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if archSkipFeature(feature, version) {
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continue
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}
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// Check against the flags.
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_, ok := cpuinfoFlags[feature.String()]
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if !info.shouldAppear && ok {
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t.Errorf("Unexpected flag: %v", feature)
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} else if info.shouldAppear && fs.HasFeature(feature) && !ok {
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t.Errorf("Missing flag: %v", feature)
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}
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}
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}
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func TestMain(m *testing.M) {
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Initialize()
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os.Exit(m.Run())
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}
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